<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var str ="hello";
        // console.log(str.slice(2,4).split("").join("-"))
        
        var reg =str.split("");
        console.log(reg);

        var s=reg.splice(2,2)
        console.log(s)

       /*  var res=s.join("-")
        console.log(res) */
        
    </script>
</body>
</html>